Catechol → Spiro[1,3-benzodioxole-2,1′-cyclopentane]

Participants

Reaction Steps

Catechol (11 g) and cyclopentanone (9 ml) were heated under reflux in toluene (150 ml) with p-toluenesulfonic acid (0.18 g) with a water trap. After 18 hours, the mixture was concentrated and purified by chromatography (silica gel, heptane/ethyl acetate 4:1). This resulted in the product with the molecular weight of 176.22 (C11H12O2); MS (ESI): 177 (M+H+).

Provenance & Evidence